dev-python/twisted: Clean old versions up

dev-python/twisted/files/twisted-core-9.0.0-respect_TWISTED_DISABLE_WRITING_OF_PLUGIN_CACHE.patch

@@ -1,11 +0,0 @@
---- twisted/plugin.py
-+++ twisted/plugin.py
-@@ -174,7 +174,7 @@
-             if pluginKey not in existingKeys:
-                 del dropinDotCache[pluginKey]
-                 needsWrite = True
--        if needsWrite:
-+        if needsWrite and os.environ.get("TWISTED_DISABLE_WRITING_OF_PLUGIN_CACHE") is None:
-             try:
-                 dropinPath.setContent(pickle.dumps(dropinDotCache))
-             except: